Grade 9 Titanium Tube (Ti-3Al-2.5V)
Jan 20, 2026
What Is Grade 9 Titanium Tube
The term half 6-4 is used to describe grade 9 titanium tube on occasion. This combination of titanium with 3 percent aluminum and 2.5 percent vanadium offers 20 to 50 percent more mechanical strength than the commercially pure (CP) titanium grades, but is more formable and weldable than Ti-6Al-4V (Grade 5). The properties make it an excellent choice for high-performance applications where strength, weight, and corrosion resistance are important.
Chemical Composition
Titanium balance; aluminum 3 percent nominal; vanadium 2.5 percent nominal; small amounts of impurity elements such as iron, carbon, hydrogen, nitrogen, and oxygen.
Physical and Mechanical Properties
Density: 4.48 g/cm3. Melting point: about 1660 deg C. Per ASTM B338/B861, tensile strength is 620 MPa minimum, yield strength (0.2% offset) 483 MPa minimum, and elongation 15 percent minimum. (Some marketing texts quote higher values typical of Grade 5; the governing values are those in the applicable ASTM standard.)
Available Sizes for Bicycle Use
| Outside (mm) | Wall thickness (mm) | Length (mm) | Application |
|---|---|---|---|
| OD 16 - OD 50.8 | 0.5-1.6 | 500-6000 | Titanium bicycle parts (GR.9) |
Applications
Grade 9 titanium tube is widely used for producing titanium bicycle frames, wheelchair components, aerospace hydraulic tubing, chemical equipment, and other products requiring a balance of strength, formability, and corrosion resistance.
Frequently Asked Questions
What is the tensile strength of Gr9 titanium tube? 620 MPa minimum per ASTM B338/B861, with yield strength 483 MPa minimum.
Why is Gr9 called half 6-4? Its 3Al-2.5V composition is approximately half the alloy content of Ti-6Al-4V.
What is Gr9 used for? Bicycle frames, wheelchair parts, aerospace hydraulic tubing, and chemical equipment.
What are the physical properties of grade 9 titanium tube? Density is 4.48 g/cm3 and the melting point is about 1660 deg C.
Why is grade 9 easier to fabricate than grade 5? Grade 9 offers 20 to 50 percent more mechanical strength than the commercially pure grades but remains more formable and weldable than Ti-6Al-4V.
What sizes of grade 9 tube are available for bicycles? Outside diameters from 16 to 50.8 mm with wall thicknesses of 0.5 to 1.6 mm and lengths of 500 to 6000 mm.
